Modeling an scene with impossible objects

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

Thread Tools Display Modes
  09 September 2013
Modeling an scene with impossible objects

Hi all!

For school we have to model a scene with a building that contains several impossible objects a la mc Esher. I have chosen the scene as seen in the attachment. Of course this can't actually be modeled as it's draw so we have to set up a camera. Through this camera the scene has to look exactly like the picture, and we have to come up with a way to model it. Pieces of the scene may be far a way from each other when looking in perspective view, as long as it looks like the picture through the "Illusion camera" it's fine.

I have to position the camera first before I start modeling. I'm having trouble with setting up my camera though.
I've set the picture to an image plane in Maya as a reference. I'm trying to line up the view of the camera to match the view of the image with the help of a cube.
It seems impossible to line them up though. Once I have a few lines lined up with a cube another part of the image doesn't match. I'm fiddeling around with focal length of the camera and such but no luck.

How would I do this, or is this impossible? I guess if the drawing contains any errors it would be impossible wouldn't it? Getting kinda crazy trying to figure this out.

  09 September 2013
This should be pretty easy.

Make sure you camera is set to be orthographic (there is an orthographic tab in the attributes for all cameras)

Then line up your image plane to the camera the way you want it. Push it back in Z so you have space to work.

Start modeling from the back and work your way forwards towards the camera.

Ignore real space when you need to. In proper 3d space it will look weird!

I just blocked out most of the picture in your link in a few min. worked pretty well!

lighting would be more of a challange. would probably have to bake and hand paint it in a bit


Last edited by Cyberone : 09 September 2013 at 09:44 PM.
  09 September 2013

I'm sorry but I have absolutely no idea what you're talking about in the first sentence.
What does all this mean.
" Make sure you camera is set to p, li { white-space: pre-wrap; }be orthographic (there is an p, li { white-space: pre-wrap; }orthographic tab in the attributes for all cameras)"

I actually talked to a 2nd year student today who said this is picture is a mixture of Isometric and some parts Perspective view. She said I had to to do something with film offset to make my horizon lower or something. This makes maya behave VERY strange though. I have no idea how to use it. My camera panning is super fast now (not rotating around object) focusing on object doesn't work anymore it's way off. Also zooming is weird now. Would this also work or am I missing something.
  09 September 2013
sorry that was a weird copy paste formatting thing from linux

I have fixed my above post.

yes the picture is a mix of isometric and perspective but you could cheat the perspective.

Setting the camera to orthographic should get you most of the way there.

Just model to that camera. It will look weird in the maya perspective view.

This will only ever work for a still camera.

also make a new orthographic camera to model to and render with. dont use mayas default perspective view.
  09 September 2013

We can't use a camera set to orthographic. I can't remember why that was just now but I guess there are some issues with that. I only remember we can't use it. The "illusion camera" also has to show depth which there isn't with orthographic. I also can't distort any of the geometry. Meaning for example a roof can't be at an angle, it has to be straight, like it would be if it were real. We are allowed to rotate an entire building though. I also know there are a couple of lines that are wrong but it's not many, only a couple. The rest should. According to the teachers I SHOULD be able to get it right by only adjust the camera using the dolly tool and adjusting the camera's focal length. I can get a very large portion of the image lined up but mostly the left building will be misaligned.

Here is the Maya file:
  09 September 2013
Thread automatically closed

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
Thread Closed share thread

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Society of Digital Artists

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump

All times are GMT. The time now is 05:53 AM.

Powered by vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.